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uniqueness check restricted to certain (model) resources [message #1110763]

Tue, 17 September 2013 09:53

Lars Martin

Messages: 24
Registered: July 2009

Junior Member

Here is the relevant portion of my sample dsl.

Variable:
   name=ID '=' expression=Expression;
Expression:
    IntConstant | StringConstant | VariableRef;
IntConstant:
    value=INT;
StringConstant:
    value=STRING;
VariableRef:
    '$' variableRef=[Variable];

I've implemented a customized ImportUriGlobalScopeProvider that overwrites getImportedUris() to add builtin variables separated into two models 'default.mydsl' and 'readonly.mydsl'. The given grammar doesn't prevent the user to overwrite variables defined in 'readonly.mydsl' (same here for 'default.mydsl'). So how can I ensure that variables defined in 'readonly.mydsl' are not allowed to be overwritten:

default.mydsl:

RW=""
..

readonly.mydsl:

RO=""
...

current.mydsl (implicitly imports default.mydsl + readonly.mydsl):

NEW=""
RO=$RO
RO=""
RW="" <- assignment should not be allowed b/c RW is defined in readonly.mydsl
RW=$RO  <- assignment should not be allowed b/c RW is defined in readonly.mydsl

Could NamesAreUniqueValidator + NamesAreUniqueValidationHelper help solve this problem? But how to restrict the uniqueness constraint to elements defined in readonly.mydsl?

Regards, Lars M

[Updated on: Tue, 17 September 2013 09:55]

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Re: uniqueness check restricted to certain (model) resources [message #1110905 is a reply to message #1110763]

Tue, 17 September 2013 13:39

Alexander Nittka

Messages: 1193
Registered: July 2009

Senior Member

To me, the simplest approach seems to be asking the index for variables declared in readonly.mydsl and validating that those names are not used elsewhere. NamesAreUniqueValidator and Helper in their original implementation are restricted to local names. It is a matter of taste whether you put the above logic there or in the normal validator.

Alex

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Re: uniqueness check restricted to certain (model) resources [message #1110968 is a reply to message #1110905]

Tue, 17 September 2013 15:20

Lars Martin

Messages: 24
Registered: July 2009

Junior Member

Obviously a small error slipped in my sample code (variable names RO/RW were mixed up). But I think you've got the point.

NEW=""
RW=$RW
RW=""
RO="" <- assignment should not be allowed b/c RO is defined in readonly.mydsl
RO=$RW  <- assignment should not be allowed b/c RO is defined in readonly.mydsl

I will try asking the index as suggested.

Regards, Lars M.

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